Stapling-machine.



E. T; GREENFIELD.

STAPLING MACHINE. .APPLIOATION FILED JUNE 23, 1911.

Patented Apr. 30, 1912.

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EIDVJIN T. GREE'NFIELD, OF KIAMESHA, NEW YORK, ASSIGNOR TO GREENF I ELZD AUTO- MATIC FASTE'NER COMYANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

STAPLING-MACHINE.

Specification of Letters Patent.

Application filed June 23, 1911. Serial No. 634,949. I

To all whom it may concern:

Be it known that I, Fnwm T. GREEN- riizco, a citizen of the United States, and resident of Kianiesha, county of Sullivan, and State of New York, have made a new and useful Invention in Stapling-Machines, of which the following is a specification.

My invention is directed particularly to an improvement in stapling machines such as are disclosed in prior patents granted to me on the 1st day of December, 1896 and 12th day of October, 1909, and numberedrespectively 572,298 and 936,996,'and it has for its objectsfirst, to provide holding means for preventing the last staple of a staple strip of the kind utilized in such ma chines from clogging the outlet of the machine; and second, to so construct such holding means that the last staple of thestrip may be utilized.

As disclosed in my prior Patent No. 936.9%, it often occurs in using a machine like that illustrated in. my earlier Patent No. 572,293 that the last staple of a. strip will turn and choke up the outlet of the machine, so that it can only again be used after such staple is dislodged, this objectionable feature constituting a serious aggravation. In my Patent- No. 936,996, I have disclosed a means for overcoming these objections by utilizing a feed pawl below the staple strip and a holding pawl above the same and so arranged that the feed pawl yieldingly holds each staple to be severed in the outlet so that the last staple cannot fall or choke the machine and may be driven and clenched.

My present improvement is more espccially applicable in connection with the machine disclosed in my earlier patent al though it may be utilized with stapling inachines generally which successively sever staples integrally united together in strip form.

For a full and clear understanding of my invention such as will enable others skilled in the art to construct and use the same, reference is had to the accompanying drawings in which Figure 1 is a longitudinal sectional view taken through a stapling. machine illustrating my improvement as applied thereto, a strip of staples being shown in position in sectional view with two of the staples illustrated in sideelevational View.

Fig. 2. is a detail vertical sectional view taken through Fig. l on the line XX and as seen looking thereat from right to left in the direction of the arrows, the plunger and the spiral operating spring not being seen in this view. Fig. 3 is a detail plan view of the novel improvement for effecting the objects hereinbefore referred to. Fig. 4c is a detail sectional longitudinal view taken through the staple supporting guide-Way illustrating my novel improvement as ap plied thereto. Fig. 5 is a detail plan view as seen looking at Fig. t from the top toward the bottom of the drawings.

Referring now to the drawings in detail and first to Fig. 1, 1 and 2 represent the base and pivotal part, of the machine and 3 the staple supporting guide-way secured to the part 2 and the base 1 by .a pivot pin 4. 5 represents a plunger, 6 the driving head thereof and 7 the spiral operating spring which returns the plunger to its normal position and effects the feed or the staple strip after the staple is severed. 8 representsan inclined lug or shoulder on the rear surface of the plunger adapted to ,opcrate against the curvilinear faces of an op crating dog 10 pivoted to the machine by a pin 9. To the lower end of the dog 10 is pivotally supported a propelling pawl 11, the tceding'end thereof being adapted to have operative connection with the staples of the staple strip. 13 is a holding pawl and 14- is a two-part spring secured to the part 2 with its opposite ends bearing respectively against the under and upper surfaces of the pawls 11 and 13, as shown. 15 represents a strip of staples of well known form, such as is. disclosed in connection with either oi my prior patents, it being understood that. it is only necessary that the feed ing and holding ends of the two pawls 11 and 13 shall be constructed to adapt them to any type of staple strip which is generally utilized in the art.

The machine so far described is old and well known and has been in public use for a number of years and its operation will be obvious on inspection of the drawings. My improvement embraces the additional features which will now be described.

I bore a cylindrical hole 18 in one end of the staple supporting guide-way 3 of sufficient diameter to slidingly support a rod 19, and then cut a horizontal transverse slot 16 and a vertical slot 17 at right angles to scribed holding means for the last staple of the strip embracing a slidable rod having angular faces adapted to support the staple in the outlet and a spring for holding said rod in its advanced position; the outer end of said rod having an inclined face adapted to be acted uponlby' the plunger as it desccnds, substantially as described. I

4. In a stapling machine of the type described a holding device for preven Mug the last staple of the staple strip from clogging the outlet of the machine QIHbIW ing a staple supporting guide-way, a slidable rod carried by said guide-way, yielding means carried the outlet, said rod having an inclined face located under the staple driving plunger; together with yielding means for normally holding the rod in its. advanced position, substantially as described.

In testimonywhereof I havesigned my name to this specification in the presence of two subscribing Witnesses.

EDWIN T. GREENFIELD.

Witnesses:

M. F. KEATING, C. J. KZNTN R.

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